Reenforced-edge plaster board



.1. scHuMA-CHER RIJENFRQED EDGE PLASTER BOARD Nov. 6, 192s. 1,590,253

Filed Oct. 12,' 1925 ml/.NT-OR.v Jai/7 56h/mad A TToRNgYs.

Patented Nov. 6, 192s.

`JOHN SCHUMAGHER, '0F LOS AIN'GCEIiIESyC'ALIFORNIA.

' REENFORCEDEDGE PLASTER BOARD.

Application led October 12, 1925. vSerial No. 61,981.

This invention relates to a plaster board formed with a cementitious core and having cover sheets of pliable material. It appertains more particularly to a board having its edge corners reenforced with resilient yielding material. The coreof plaster board being of a substantially brittle cementitious material is frequently cracked, crushed, chipped, and otherwise injured at its corner yedges during handling of the board. It also happens that the cover sheets are peeled back at the corners ,due to careless handling of the board.

The primary object of this invention 1s the provision of a plaster board having smooth reenforced corners at the edge, the latter being arranged to provide yielding resilient corners lending themselves to nailing to better advantage, less liable to injury and reenforcing the board.

These objects together with other ob]ects and corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawing, in which: .i

Fig. 1 is a perspective View showing a fragment of a plaster board panel at the edge, with a portion cut away to show a method of reenforcement; and` Fig. 2 is a similar view showing another method of reenforcingl the board.

Referring more particularly to Eig. 1, the usual `plaster core 3 covered on its upper and lower faces with paper sheets 4 and 5 an bonded to the core in the manner well known in the art is illustrated. The cover sheets are of such width that they may be turned under and embedded in the core as indicated by 6 and 7 These sheets are folded to provide a beaded corner, and enveloped in the corners and extending the length of the board `are lengths of cord or twine indicated by 8 and V9.- This construction provides a board which has smooth rounded corners of suflicient resiliency to act as yielding buffers and protect the plaster core. The Y embedded ends 6 and 7 act to reenforce the core at the edges, and the exposed edge face 10 is such that the cement putty used beso tween panels will effectively adhere and bond itself to the board. It is obvious that all the edges or any number thereof may be reenyforced in the manner described.

Referring more particularly to Fig. 2, the u plaster core of a panel is indicated by 11 and the usual cover sheets by 12 and 13. The width of the cover sheets is greater than the plaster core, and in the formation of the core, the edges of the sheets are folded back upon themselves as indicated by 14 and 15.

'The folded edges are then bent at right angles to form overhanging corners or angles land 17 leaving a partially exposed face .18. In this manner a protected corner having buffer qualities is provided, and at the saine time, the raw edge of the cover' sheets is embedded in the plaster core.

What I claim is:

1. product of the characterdescribed comprising a cementit-ious core, a Vcover sheet of pliable material underfolded at the edge corner, the creased port-ion being beaded to form an edge corner and corner guard, andV the cementitious core being exposed at the edge.

2. A product of the character described comprising a cementitious core, a cover sheet of pliable material underfolded at the edge corner, the inturned edge being embedded in the cementitious core and the creased portion being beaded to forni an edge corner and corner guard.

f 3. A product 'of the character describedv comprising a cementitious core, a cover sheet of pliable material underfolded at the edge corner, the inturned ledge being embedded in the plaster core and beaded to form an `edge corner and corner guard, the cementitious core being exposed at the edge. y

4. A product ofv the character described .comprising a cementitious core, a cover sheet of pliable material underfolded at the edge corner, a length of cord enveloped in theV 5. A product of the character described comprising a cementitious core, a cover sheet of pliable material underfolded at the edge corner, the inturnedv edge being embedded in the cementitious core, the creased portion at theedge being beaded to form an edge corner and corner guard, and arlength of portion of the sheet formed by said fold bener guard and to project. into the ceinentitiing beaded to form u corner guard, a length ons eore to reenforee the corner. of twine being encircled by die bead portion. In witness that I claim the foregoing I 10 7. A product of the character described have hereunto Subscribed my nznne this 28th 0 eoniprieingnT a cenflentitions core7 a cover sheet day of September, 1925.

of pliable material nnderfolded at one edge, the foldingr line being beaded to form a eor- JOHN SCHUMACHER. 

